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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-17-2007, 08:39 AM   #1 (permalink)
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Truck won't start fuel gelling up?

I'm new to the diesel industry...here's my scenerio, i have a 2000 F250 with 150,000mi(the one in my sig and avatar)...if the trucks plugged in all night, it starts fine and goes to high idle, and i can drive it after letting it warm up only a short time (10 min). i park at work all day (not plugged in) and when i go to start it in the afternoon (8 hours later) it cranks a long time, then fires up (i'm good right?) then it runs fine for about 2 minutes and dies, just cuts out, or it hops a bit, like it's trying to go to high idle, but it can't so its up and down and up and down then wham, it dies...i run the glow plugs again, and try to start, it literally has to crank for 20 full seconds before it cranks faster and faster until it kinda fires and then it jumps around a bout 15 seconds till all 8 are firing again...this is also accompanied by lots of white smoke...any suggestions?

I thought it was glow plugs, so i had enough time last saturday to install the driverside plugs (about 2 hours) but didn't get to the passenger side, i'm going to do those tonight. I'm thinking it's a fuel problem, because of how it simply cuts out...thanks in advance for you help!!

And i don't run my truck hard (that's the truth), i got the chip and junk just for fun (in the summer, i don't like running my trucks hard in the winter, unless it's my buggy...which was built to break), but i mostly drive this truck back and forth to work, and tow my off road buggy back and forth to the trails...


Chuck
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Old 01-17-2007, 08:47 AM   #2 (permalink)
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Re: Truck won't start fuel gelling up?

Get a case or 2 of Stanadyne from these guys and also change out your fuel filter, drain the water.

http://www.stanadyne.com/new/ppt/ppt...p?dealerID=114
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Old 01-17-2007, 08:55 AM   #3 (permalink)
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Re: Truck won't start fuel gelling up?

I was going to stop at the parts store and get some LE Diesel additive (that's what a friend at work suggested). And i replaced the fuel filter about 20,000mi ago, but bought another new one the other day(i'll put that on tonight too)

Thanks for your speedy reply!
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Old 01-17-2007, 09:04 AM   #4 (permalink)
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Re: Truck won't start fuel gelling up?

20k is too long for a filter change, every 10-15k is recomended.
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Old 01-17-2007, 09:35 AM   #5 (permalink)
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Re: Truck won't start fuel gelling up?

[ QUOTE ]
20k is too long for a filter change, every 10-15k is recomended.


[/ QUOTE ]

Oh....well thank you!! I'll do that first thing, i just ran to the parts store and bought some additive, put that in, ran it down tot he speeday and put in 30 gallons of winterized diesel.

Can someone explain the glow plug relays to me? There are two of them correct? just behind the fuel filter, i bought one new one of those ($65) so i'd like to know if that's my problem too, just in going to the gas station, it still cranked a long time before anything fired up...i'm wondering if my glow plugs aren't even coming on...
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Old 01-17-2007, 10:00 AM   #6 (permalink)
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Re: Truck won't start fuel gelling up?

Why would you warm the truck up for 10 minutes or so if the truck was plugged in all night? [img]/ubbthreads/images/graemlins/confused.gif[/img]

Drain the water seporator and change the filter regardless of when you changed it last. Add some Stanadyne and run it for at least 1/2 hour on a major highway to make sure the additive gets completely into the fuel system.

I would consider changing the CPS module. [img]/ubbthreads/images/graemlins/smokin.gif[/img]


...

[img]/ubbthreads/images/graemlins/warmsmile.gif[/img]
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Old 01-17-2007, 10:09 AM   #7 (permalink)
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Re: Truck won't start fuel gelling up?

[ QUOTE ]
Why would you warm the truck up for 10 minutes or so if the truck was plugged in all night? [img]/ubbthreads/images/graemlins/confused.gif[/img]

Drain the water seporator and change the filter regardless of when you changed it last. Add some Stanadyne and run it for at least 1/2 hour on a major highway to make sure the additive gets completely into the fuel system.

I would consider changing the CPS module. [img]/ubbthreads/images/graemlins/smokin.gif[/img]


...

[img]/ubbthreads/images/graemlins/warmsmile.gif[/img]

[/ QUOTE ]

I have to warm it up, it'll die if i fire it up and pull away from the house, even if it is plugged in all night...(glow plug relays?) It blows lots of white smoke too when it does that.

Well, i told you i was new to this diesel stuff...so, i didn't know there was a water seperator, i'm talking to my buddy on the phone right now...(owner of a '99 F250 PSD) and he told me how to drain that.

We're also going to check the relays to see if they're working or not.

What makes you say CPS...my buddy changed his because he was having intermittent misses while driving and running the windshield wipers...my truck doesn't miss at all once the temp gauge is up.
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Old 01-17-2007, 10:19 AM   #8 (permalink)
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Re: Truck won't start fuel gelling up?

[ QUOTE ]
[Can someone explain the glow plug relays to me? There are two of them correct?

[/ QUOTE ]There are two relays but only one is the glow plug relay. The one closest to the firewall controls the glow plugs and the forward one fires an Intake Air Heater. The latter only works when idling with low oil temperature and is primarily an emissions bandaid. [ QUOTE ]
"To reduce white smoke during long idle periods at low ambient temperatures, the PCM will activate the intake air heater. Specific conditions must be present before the heater is activated: "

ambient temperature must be below 0 deg C (32 deg F)
engine oil temperature must be below 55 deg C (131 deg F)
vehicle power must be between 11.8 and 15 volts
parking brake must be applied on manual transmission vehicles
the transmission must be on park or neutral on automatic transmission vehicles
glow plugs must be off

[/ QUOTE ]

The GPR is probably out. Sx include hard starting and clouds of white smoke smelling like ............. unburned diesel.

Consider replacing the GPR with a Stancor contactor.
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Old 01-17-2007, 10:24 AM   #9 (permalink)
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Re: Truck won't start fuel gelling up?

[ QUOTE ]
[ QUOTE ]
[Can someone explain the glow plug relays to me? There are two of them correct?

[/ QUOTE ]There are two relays but only one is the glow plug relay. The one closest to the firewall controls the glow plugs and the forward one fires an Intake Air Heater. The latter only works when idling with low oil temperature and is primarily an emissions bandaid. [ QUOTE ]
"To reduce white smoke during long idle periods at low ambient temperatures, the PCM will activate the intake air heater. Specific conditions must be present before the heater is activated: "

ambient temperature must be below 0 deg C (32 deg F)
engine oil temperature must be below 55 deg C (131 deg F)
vehicle power must be between 11.8 and 15 volts
parking brake must be applied on manual transmission vehicles
the transmission must be on park or neutral on automatic transmission vehicles
glow plugs must be off

[/ QUOTE ]

The GPR is probably out. Sx include hard starting and clouds of white smoke smelling like ............. unburned diesel.

Consider replacing the GPR with a Stancor contactor.

[/ QUOTE ]

Thanks for the advice!! [img]/ubbthreads/images/graemlins/smile.gif[/img] ....now what's a GPR? and a Stancor contactor? [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 01-17-2007, 10:30 AM   #10 (permalink)
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Re: Truck won't start fuel gelling up?

GPR is glow plug relay. Stancor is a manufacturer of electrical components. Look at this thread.
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Old 01-17-2007, 11:17 AM   #11 (permalink)
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Re: Truck won't start fuel gelling up?

I had the same problem two days ago and used a product called DIESEL 911. The main purpose of the fuel additive is to UNGEL the diesel fuel.
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Old 01-17-2007, 06:39 PM   #12 (permalink)
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Re: Truck won't start fuel gelling up?

It hasn't been cold enough in Indiana (yet) this winter to gell up even straight No.2.

I think you have some water in your fuel and it is icing up in the fuel system some place.
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Old 01-18-2007, 07:40 AM   #13 (permalink)
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Re: Truck won't start fuel gelling up?

[ QUOTE ]
It hasn't been cold enough in Indiana (yet) this winter to gell up even straight No.2.

I think you have some water in your fuel and it is icing up in the fuel system some place.

[/ QUOTE ]
Doesn't No.2 gell up at like 20 degrees? It's been that cold in Lafayette (at night) Wind chill was 4 yesterday morning...

Anyways...i drained a bunch of crap (water/diesel) last night, put in a new fuel filter, and measured my glow plug relay, and found it dead, i replaced that, and thought, Great! It's all fixed now!! i'm gonna run the plugs and it should start up like it used to! rAAPP!!! But no...it still cranks at least 15 cranks before anything, and then it just kinda starts slowly....no romping, but no Raap either, it used to crank about 4 times then rrRRAAAPP! and it would run great...

Someone suggested a CPS yesterday, i'm thinking this may be the case...like it has to rotate the camshaft a full turn before it figures out where it's at??? then it fires....


i'm stumped...but this morning i had it plugged in, i fired it up (after at least 15 cranks) (when i say crank, i mean one piston up...) Fired it up, and drove off...it didn't die today :-) Which is a big improvement over the last 2 months....yeah, it's been 40 - 50 degrees and it's still been dying...(that had to have been fuel related, like water)

Again, any help is MUCH appreciated!
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Old 01-18-2007, 07:59 AM   #14 (permalink)
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Re: Truck won't start fuel gelling up?

How old are your batteries?
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Old 01-18-2007, 08:21 AM   #15 (permalink)
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Re: Truck won't start fuel gelling up?

[ QUOTE ]
How old are your batteries?

[/ QUOTE ]
Well, i can't honestly answer that question, but it doesn't crank slow. Last year my friend put new batteries in his, and his test was to see if his truck would start on one battery, and it didn't...he wanted to see if a truck with good batteries COULD start with only one hooked up, so we disconnected one of mine, and it fired right up...i can't see it being the batteries, i have good voltage, good fast cranking, long cranking and they still have juice...
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